title: [Cervical spine motion during laryngoscopy with the Pentax-AWS with a new thinner blade (Introck-T)].
abstract: BACKGROUND
  The Pentax-AWS equipped with a new thinner blade (Introck-T) is an intubation device that provides a non-line-of sight view of the glottis. A non-line-of sight view is expected to cause less movement of the cervical spine during laryngeal visualization. We measured the degree of cervical spine movement during laryngoscopy with the device.
  
  
  METHODS
  Twenty patients requiring general anesthesia were studied. Each patient underwent laryngoscopy using the Pentax-AWS with the Introck-T. Movements of cervical spine were measured by radiography in the same patient both at neutral head position and during laryngoscopy.
  
  
  RESULTS
  The anterior movement of the vertebral bodies from baseline was 16.7 +/- 5.2 mm, 16.5 +/- 4.4 mm, 16.5 +/- 4.7mm and 15.5 +/- 4.7mm at the atlas (C1), C2, C3, and C4 vertebrae, respectively, during laryngoscopy. The change in angle during laryngeal visualization was 8.3 +/- 4.0 degrees, 7.6 +/- 3.7 degrees, 1.7 +/- 2.4 degrees, and 1.6 +/- 3.3 degrees, at Occiput/C1, C1/C2, C2/C3, and C3/C4 motion segments, respectively. The total change in angle between the occiput and C4 was 19.1 +/- 5.1 degrees (95% CI 16.6 degrees - 21.5 degrees).
  
  
  CONCLUSIONS
  Laryngeal visualization using the Pentax-AWS with the new thinner Introck-T produces the anterior movement and extension of the cervical spine.
authors.affiliation: Department of Anesthesiology, International University of Health and Welfare Hospital, Nasushiobara 329-2763.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Hirabayashi
authors.forename: Akifumi
authors.initials: A
authors.lastname: Fujita
authors.forename: Hideharu
authors.initials: H
authors.lastname: Sugimoto
mesh_terms: D000328:Adult; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000502:physiology*; D004867:Equipment Design; D005260:Female; D006801:Humans; D020704:Laryngoscopes; D007828:Laryngoscopy; D009068:Movement / Q000502:physiology; D011859:Radiography